Great Falls L&C Interpretive Center, Montana

Cropped map of the Corps of Discovery's route.
Click on the map for a larger view.

Great Falls was the first real obstacle for the Corps of Discovery, mile after
mile of rapids and waterfalls, where the canoes and supplies had to be portaged
by foot. Worse, because of their determination to follow the Missouri to its
source, they missed a shortcut that could have saved them a couple of hundred miles
of travel, though they couldn't have known it at the time.

The real problem was, because of this delay, they would encounter snow in
the Bitterroots.

Related Links

US-89 is a remarkable road that follows some of the
most scenic areas of the West from Canada to Arizona, and along the way passes
through (or comes within a few miles of) over a half dozen major Western Parks.
Glacier to Yellowstone to Grand Teton, Bryce, Zion, Glen Canyon and Grand Canyon.

I've actually frequented this road quite a bit, but in a disjointed, non-continuous
fashion.